Adsorption and photocatalytic degradation of acetonitrile: FT-IR investigation

Davit, Patrizia; Martra, Gianmario; Coluccia, Salvatore; Augugliaro, Vincenzo; López, Elisa García; Loddo, Vittorio; Marcı̀, Giuseppe; Palmisano, Leonardo; Schiavello, M.

doi:10.1016/s1381-1169(03)00354-6

Cited by 28 publications

(11 citation statements)

References 12 publications

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“…On this basis, it may be assumed that for both regimes the photocatalyst irradiation determines the acetonitrile photoadsorption [21,[23][24][25][26] on TiO 2 surface sites. The subsequent reaction between adsorbed acetonitrile and phototoproduced • OH radicals (see (2) to (5)) enables to break the C-C bond producing probably cyanide radicals and methanol:…”

Section: Mechanistic Aspectsmentioning

confidence: 99%

“…The adsorption of acetonitrile on TiO 2 Merck occurs by means of hydrogen bonding with the surface OH groups through the lone-pairs of the nitrogen atoms [21]. The interaction is weak so that acetonitrile adsorption results are completely reversible although the organic molecule is adsorbed more strongly than water on TiO 2 surface.…”

Section: Acetonitrilementioning

confidence: 99%

“…Acetonitrile was oxidised to carbonate and nitrate and the main inorganic intermediate detected was cyanate, while only traces of cyanide and nitrite were found. Recently the kinetics and mechanistic aspects of acetonitrile photocatalytic degradation in gas-solid regime have been investigated by using TiO 2 Degussa P25 and TiO 2 Merck [21]. With both catalysts, the photodegradation products of acetonitrile were CO 2 and HCN; the presence of HCN is a drawback for the application of photocatalytic method to acetonitrile degradation since a further step devoted to the elimination of HCN must be added to the photoprocess.…”

Section: Introductionmentioning

confidence: 99%

“…To this aim, the degradation runs have been carried out both in gas-solid and in liquid-solid regime. The information obtained from the photoreactivity experiments, together with that obtained by previous FT-IR spectroscopy investigations [21], has been used for clarifying (at least from a macroscopic point of view) the influence of water phase, liquid or gaseous, on the photoreaction performance and to check whether its influence depends, or not, on the chemical features of the molecules undergoing the photoreaction process.…”

Section: Introductionmentioning

confidence: 99%

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The role of water in the photocatalytic degradation of acetonitrile and toluene in gas‐solid and liquid‐solid regimes

Addamo

Augugliaro

Coluccia

et al. 2006

International Journal of Photoenergy

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Photocatalytic degradation of acetonitrile and toluene was carried out both in gas-solid and in liquid-solid regimes by using commercialTiO2samples (Merck and Degussa P25). The investigation was mainly aimed to study the influence of water present in the reaction environment on the mechanism and degradation rate of two probe molecules. In gas-solid regime, the reacting mixture consisted of toluene or acetonitrile, oxygen, nitrogen, and water vapour. The main degradation product of toluene wasCO2with small amounts of benzaldehyde. In the presence of water vapour, the activity ofTiO2Merck remained stable but greatly decreased if water was absent.TiO2Degussa P25 continuously deactivated, even in the presence of water vapour. With both catalysts, the photodegradation products of acetonitrile wereCO2and HCN; the activity was stable and was independent of the presence of water vapour in the reacting mixture. The production of HCN represents a drawback of acetonitrile photocatalytic degradation but the elimination of HCN is not actually a problem. In liquid-solid regime, the main intermediates of toluene photodegradation werep-cresol and benzaldehyde; traces of pyrogallol and benzyl alcohol were also found. Benzoic acid, hydroquinone, and trans, trans muconic acid were detected only whenTiO2Merck was used. The photodegradation products of acetonitrile were cyanide, cyanate, formate, nitrate, and carbonate ions.

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Section: Mechanistic Aspectsmentioning

confidence: 99%

Section: Acetonitrilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The role of water in the photocatalytic degradation of acetonitrile and toluene in gas‐solid and liquid‐solid regimes

Addamo

Augugliaro

Coluccia

et al. 2006

International Journal of Photoenergy

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“…Therefore, a novel processing method, photocatalysis, has been developed for removing RhB dye wastewater. Photocatalysis is an advanced oxidation processes and has aroused more and more attention by investigators [9–23], and much scientific research on the photocatalytic degradation of aqueous organic contaminants has been reported [10–31]. Some investigations [2,32–38] about the photodegradation of RhB have been reported under ultraviolet light or visible light irradiation, showing that photocatalysis was an effective degradation method for degrading dye to a large extent.…”

Section: Introductionmentioning

confidence: 99%

Photophysical Property and Photocatalytic Activity of New Gd2InSbO7 and Gd2FeSbO7 Compounds under Visible Light Irradiation

Luan

2013

IJMS

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Gd2InSbO7 and Gd2FeSbO7 were synthesized first, and their structural and photocatalytic properties were studied. The lattice parameters and the band gaps for Gd2InSbO7 and Gd2FeSbO7 were 10.449546 Å, 10.276026 Å, 2.897 eV and 2.151 eV. The photocatalytic degradation of rhodamine B was performed with Gd2InSbO7 and Gd2FeSbO7 under visible light irradiation. Gd2InSbO7 and Gd2FeSbO7 had higher catalytic activity compared with Bi2InTaO7. Gd2FeSbO7 exhibited higher catalytic activity than Gd2InSbO7. The photocatalytic degradation of rhodamine B followed with the first-order reaction kinetics, and the first-order rate constant k was 0.01606, 0.02220 or 0.00329 min−1 with Gd2InSbO7, Gd2FeSbO7 or Bi2InTaO7 as photocatalyst. Complete removal of rhodamine B was observed after visible light irradiation for 225 min or 260 min with Gd2FeSbO7 or Gd2InSbO7 as photocatalyst. The evolution of CO2 was realized, and it indicated continuous mineralization of rhodamine B during the photocatalytic process. The possible photocatalytic degradation pathway of rhodamine B was proposed.

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Removal of drugs in aqueous systems by photoassisted degradation

et al. 2005

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Aqueous solutions of tetracycline, lincomycin and ranitidine were irradiated with UV light in homogeneous and heterogeneous systems. Two commercial polycrystalline TiO 2 powders (Degussa P25 and Merck) were used as photocatalysts. After 5 h, an appreciable photolytic degradation of tetracycline and ranitidine was observed while the degradation of lincomycin was noticeably lower. As far as the mineralization is concerned, a small decrease of the TOC values was measured in the case of tetracycline whereas negligible variations were found for lincomycin or ranitidine. The presence of the photocatalysts greatly enhanced the degradation rates of the drugs with respect to those observed during the homogeneous experiments. The Langmuir-Hinshelwood kinetic model adequately describes the experimental results and both the pseudo-first order kinetic constants of the reactions and the adsorption constants were calculated. Merck TiO 2 was more active than P25 Degussa for the photodegradation of tetracycline and ranitidine, whereas both photocatalysts showed similar performances for lincomycin. In the presence of TiO 2 Degussa P25, tetracycline was almost completely mineralized, but the reduction of the initial TOC was ca. 60% in the case of lincomycin and ranitidine. A less significant mineralization was observed by using Merck TiO 2 .

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Adsorption and photocatalytic degradation of acetonitrile: FT-IR investigation

Cited by 28 publications

References 12 publications

The role of water in the photocatalytic degradation of acetonitrile and toluene in gas‐solid and liquid‐solid regimes

The role of water in the photocatalytic degradation of acetonitrile and toluene in gas‐solid and liquid‐solid regimes

Photophysical Property and Photocatalytic Activity of New Gd2InSbO7 and Gd2FeSbO7 Compounds under Visible Light Irradiation

Removal of drugs in aqueous systems by photoassisted degradation

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